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In Search of a Visual-cortical Describing Function: a Summary of Work in Progress
A. M. Junker,K. J. Peio +1 more
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TLDR
This chapter describes the method used to obtain visual-cortical describing functions, results for different subjects under different cognitive processing demands, and discusses of what these results indicate.Abstract:
The thrust of the present work is to explore the utility of using a sum of sinusoids (seven or more) to obtain an evoked response and, furthermore, to see if the response is sensitive to changes in cognitive processing. Within the field of automatic control system technology, a mathematical input/output relationship for a sinusoidally stimulated nonlinear system is defined as describing function. Applying this technology, sum of sines inputs to yield describing functions for the visual-cortical response have been designed. What follows is a description of the method used to obtain visual-cortical describing functions. A number of measurement system redesigns were necessary to achieve the desired frequency resolution. Results that guided and came out of the redesigns are presented. Preliminary results of stimulus parameter effects (average intensity and depth of modulation) are also shown.read more
Citations
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Descriptive Linear modeling of steady-state visual evoked response
TL;DR: Model-based phase unwrapping appears to be most reliable in applications, such as manual control, where theoretical models are available and linear descriptive modeling of the VER has not yet been shown to provide consistent and readily interpretable results.
Journal ArticleDOI
The Effect of Task Difficulty on the Steady State Visual Evoked Response
TL;DR: In this article, the authors measured the steady state visual evoked responses to sum-of-sine wave modulated light for subjects as they performed a decision-making task.
References
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A Frequency Response Method for Analyzing and Synthesizing Contactor Servomechanisms
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Recent advances in electrical recording from the human brain
TL;DR: This work has shown that evoked potentials can be used as a diagnostic tool in some pathological conditions, as well as shedding light on the mechanisms by which sensory information is processed in the brain.
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Human Sensitivity to High Frequency Sine Wave and Pulsed Light Stimulation as Measured by the Steady State Cortical Evoked Response
TL;DR: In this article, the amplitude was found to be greatest at one particular frequency of stimulation, with the magnitude of the response to the peak frequency as much as double the amplitude of the surrounding frequencies.
Descriptive Linear modeling of steady-state visual evoked response
TL;DR: Model-based phase unwrapping appears to be most reliable in applications, such as manual control, where theoretical models are available and linear descriptive modeling of the VER has not yet been shown to provide consistent and readily interpretable results.
Journal ArticleDOI
The Effect of Task Difficulty on the Steady State Visual Evoked Response
TL;DR: In this article, the authors measured the steady state visual evoked responses to sum-of-sine wave modulated light for subjects as they performed a decision-making task.
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